我正在尝试将这个用 maven 编译的portlet https://github.com/tlipski/newsletter-for-liferay转换为 Liferay 项目（然后我可以在 Liferay IDE 中使用它）。一切似乎工作正常，但我不知道应该将 hibernate.cfg.xml 文件放在 Liferay 项目中的哪个位置以使其工作。目前我在 WEB-INF/classes 文件夹中有它，我收到了这个错误：
ERROR java.lang.ClassNotFoundException: org.hibernate.cfg.Configuration
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
at pl.net.bluesoft.rnd.newsletter.model.HibernateUtil.<clinit>(HibernateUtil.java:28)
at pl.net.bluesoft.rnd.newsletter.portlets.VaadinApplicationPortlet2.handleRequest(VaadinApplicationPortlet2.java:23)
at com.vaadin.terminal.gwt.server.AbstractApplicationPortlet.doDispatch(AbstractApplicationPortlet.java:728)
at javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:101)
at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:64)
at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:92)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at com.liferay.portlet.InvokerPortletImpl.invoke(InvokerPortletImpl.java:638)
at com.liferay.portlet.InvokerPortletImpl.invokeRender(InvokerPortletImpl.java:723)
at com.liferay.portlet.InvokerPortletImpl.render(InvokerPortletImpl.java:425)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)